weaknessweak·ness /ˈwiːknəs/ noun1[uncountableU] a lack of power, success, or influenceThe stock market doesn’t fully reflect the weakness in the economy.
With this weakness in the market, buyers are able to name their prices and find willing sellers.
2[countableC] part of something that can be criticized easilyA major weakness of the firm has been its reliance on its headquarters in Atlanta for making decisions.
a serious weakness in the system